French physicist (1875–1960) who made advances in the study of X-ray diffraction, spectroscopy, and radio communications. ALS in French, signed “Broglie,” one page, 8.25 x 10.5, personal letterhead, November 22, 1949. Untranslated letter mentioning his wife and the ruins of Ferrieres. In fine condition, with central vertical and horizontal folds and light creases. RR Auction COA.
